VOA慢速英语:Broccoli and Cauliflower - Their Tops Make Good Eating

例句：Nectar and pollen are very nutritious.
      花蜜和花粉是很有营养的。

2.substance n.物质, 物品, 东西

例句：Soil consists of various chemical substances.
      土壤由各种化学物质组成。

substance和material的区别

material是指制做某种物品或做某事的“材料、原料”：buildingmaterials，dress materials，reading materials等；substance指特定的某种物质、东西：Air，water，rubber，glass and soil are different substances．

3.daily adj.每日的, 日常的

例句：He does daily exercises to help control his weight.
      他为控制体重而每天坚持锻炼。

4.fertile adj.多产的, 富饶的

例句：Plants grow well in fertile soil.
      植物在肥沃的土壤里长势良好。
 
5.moist adj.潮湿的, 微湿的,湿润的

例句：Strawberries grow best in a cool, moist climate.
      草莓最适于在凉爽、潮湿的气候条件下生长。

6.differ vi.不同,不同意,与…不一致

例句：Customs differ in different countries.
      各国风俗不同。

7.steam vt.蒸煮

例句：She is steaming fish for supper.
      她在蒸鱼准备吃晚饭。